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Castle nut adjustment or king pin ? #649870
11/07/20 11:42 AM
11/07/20 11:42 AM
Joined: Mar 2009
Posts: 2,093
southwest France
M
meabh Offline OP
Talk Morgan Expert
meabh  Offline OP
Talk Morgan Expert
M

Joined: Mar 2009
Posts: 2,093
southwest France
I noticed a slight and rapid knocking noise from the near side wheel whilst coasting down our stony drive. I jacked the front up and grasped the wheel in time honoured fashion and could produce the noise but there was hardly any back and forth movement in the wheel. The castle nut is pristine and marked in blue where the split pin is located. There is no uneven wear on the tyre. Spinning the wheel on the hub just produces a faint rubbing noise from the brake but nothing else. Everything else appears as it should be. I grease the king pins every 1000 miles , sometimes at five or six. The Roadster has now done 20.000 miles and the tyres were changed at BHM last February with no adverse comments. Any ideas please?

Re: Castle nut adjustment or king pin ? [Re: meabh] #649883
11/07/20 12:18 PM
11/07/20 12:18 PM
Joined: Nov 2017
Posts: 490
Suffolk Uk.
Hawki Online content
Learner Plates Off!
Hawki  Online Content
Learner Plates Off!

Joined: Nov 2017
Posts: 490
Suffolk Uk.
Mine has done around 20,000 miles and I have just booked it in for the king pins. You can however detect movement if you jack up the car An try to rock the wheel.

Re: Castle nut adjustment or king pin ? [Re: meabh] #649884
11/07/20 12:26 PM
11/07/20 12:26 PM
Joined: Jul 2007
Posts: 17,106
Suffolk
John V6 Offline
Member of the Inner Circle
John V6  Offline
Member of the Inner Circle

Joined: Jul 2007
Posts: 17,106
Suffolk
Do you have over riders? I noticed the clamp that holds one of them on had failed. That made a knocking noise.


JohnV6
2006 Indigo Blue Roadster S1
Re: Castle nut adjustment or king pin ? [Re: meabh] #649885
11/07/20 12:27 PM
11/07/20 12:27 PM
Joined: Jul 2019
Posts: 1,171
L
Luddite Online content
Has a lot to Say!
Luddite  Online Content
Has a lot to Say!
L

Joined: Jul 2019
Posts: 1,171
meabh, I am no expert, though when the car is jacked up and the wheel shoogled as you did, there is a limit to the force you engaged in the process... Perhaps it might be replicated at standstill if you put it back on all four wheels and grabbed the top of the tyre with both hands and rocked the whole car.... try to avoid the heart attack.... And if the noise returns you might have a better idea from whence it comes..? Of course if you can persuade some innocent into lying on the ground and peering in the direction of the noise, you may then discover the issue..?

It is just possible that on a ...err..rare occasion, nuts bolts and the likes may become loose on a Morgan, and other than that shocker rubber bushes can wear as can trackrod ends not to mention play in the suspension system...?

Good luck in your explorations.

Re: Castle nut adjustment or king pin ? [Re: meabh] #649886
11/07/20 12:34 PM
11/07/20 12:34 PM
Joined: Mar 2009
Posts: 2,093
southwest France
M
meabh Offline OP
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meabh  Offline OP
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M

Joined: Mar 2009
Posts: 2,093
southwest France
Thanks all. With all wheels on the ground there is very little movement. If it comes to replacing the kingpins I'll go for hard chrome but I might not be there yet.

Re: Castle nut adjustment or king pin ? [Re: meabh] #649888
11/07/20 12:46 PM
11/07/20 12:46 PM
Joined: Oct 2019
Posts: 939
Aberdeenshire
Image Online content
Talk Morgan Regular
Image  Online Content
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Joined: Oct 2019
Posts: 939
Aberdeenshire
Meabh ...not from personal experience but I have heard it said that jacking up the car lets the suspension sink to an unworn part of the kingpin, hence masking wear .... best checked on its wheels .... so if you have no wear there it may well be something else .... are both top shocker nuts tight ? ...if not they could knock when driving over rough bits.

K

Re: Castle nut adjustment or king pin ? [Re: Image] #649891
11/07/20 01:28 PM
11/07/20 01:28 PM
Joined: Aug 2013
Posts: 2,978
Solihull
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Joined: Aug 2013
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Solihull
Originally Posted by Image
Meabh ...not from personal experience but I have heard it said that jacking up the car lets the suspension sink to an unworn part of the kingpin, hence masking wear .... best checked on its wheels .... so if you have no wear there it may well be something else .... are both top shocker nuts tight ? ...if not they could knock when driving over rough bits.

K


Yup

One of our friends on here had a car like that. Not long been in to a dealer for an MOT from memory and not even an advisory. With the suspension on full droop there was no wear detectable. When I pulled the pin it had the most beautiful wear ridge, not a few thou you could measure it with a ruler!

We replicated the normally laden stub position by clamping the pin in the vice and holding it in situ at the height of a rebound spring and the rock in the stub was terrific. What was also noted was most of the play seemed to be in the kingpin not the bushes. The pins were OE factory fitted stainless.

I discussed it with Peter Mulberry who confirmed that the grade of stainless used by MMC was very soft indeed but even he had never seen anything like it. The car was high mileage but even so. I emailed the factory with a full report suggesting care advice needed issuing to its dealer network.

They never replied or acknowledged my email and I asked 2 dealers a month later, nothing had been heard from the factory.

You can only do your best.

BR
Colin


BR Colin
Who used to be a Spanner Juggler
Re: Castle nut adjustment or king pin ? [Re: meabh] #649901
11/07/20 02:19 PM
11/07/20 02:19 PM
Joined: Mar 2009
Posts: 2,093
southwest France
M
meabh Offline OP
Talk Morgan Expert
meabh  Offline OP
Talk Morgan Expert
M

Joined: Mar 2009
Posts: 2,093
southwest France
K,
I went out to check: took off the wheel. Top bolt on the shock absorber took up several turns although I don't know just how tight it should be. I felt another walk turn was to be had. One track rod arm bolt could also be tightened a bit with spanners on both ends of the bolt. Everything else seemed okay.

Once again, I am grateful to you all.

Re: Castle nut adjustment or king pin ? [Re: meabh] #649907
11/07/20 03:09 PM
11/07/20 03:09 PM
Joined: Aug 2010
Posts: 3,075
Costock, South Nottinghamshire...
Paul F Offline
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Paul F  Offline
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Joined: Aug 2010
Posts: 3,075
Costock, South Nottinghamshire...
I had similar knocking on two occasions.
1) The over-rider bracket fixing had broken
and
2) The wing stay had come adrift from the wing (the bolt had fallen out).

Both easy fixes.


Paul
Costock, UK
2014 4/4 Rolls Royce Garnet Red
Disco 4
Teddy - 17h1 Irish Draught cross
Re: Castle nut adjustment or king pin ? [Re: meabh] #649910
11/07/20 03:23 PM
11/07/20 03:23 PM
Joined: Oct 2019
Posts: 939
Aberdeenshire
Image Online content
Talk Morgan Regular
Image  Online Content
Talk Morgan Regular

Joined: Oct 2019
Posts: 939
Aberdeenshire
Meabh .... plenty more experienced people on here than me but I tighten mine to compress the rubbers enough that the bolt isn't free to knock up and down ...... . But not enough to take the compliance out of the rubbers.


K

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